. >> cutting $716 million to balance obama care is in my opinion a mistake. >> if you repeal obama care, and i have become fond of this term, obama care, if you repeal it, what happens is those seniors are going to be paying $600 more in prescription care. >> reporter: the fiercest exchange over health care and jobs. >> i just don't know how the president could have come into office facing 23 million out of work, rising unemployment, an economic crisis at the kitchen table and spent his energy and passion for two years fighting for obama care instead of fighting for jobs for the american people. >> we did work on this alongside working on jobs, because this is part of making sure that middle class families are secure in this country. >> reporter: president obama on defense. romney challenging his record as both now wait to see if this exchange had any impact on voters. it had impact online. on twitter this was the most tweeted event in u.s. plolitica history. tracie potts, nbc news, denver. >> this morning everyone is weighing in on who they think won that debate, that includes a group